Rotary electric machine with a rotor that limits magnetic flux losses, notably electric motor

Abstract

The present invention relates to an electric machine comprising a rotor ( 10 ) and a stator ( 12 ), the said rotor being formed of a rotor body ( 18 ) with a stack of laminations ( 16 ) and placed on a rotor shaft ( 14 ), the said laminations comprising housings ( 40 ) to house magnetic-flux generators ( 20 ) and polar expansions ( 42 ) situated between the external ( 36 ) and the internal ( 38 ) edge of the said laminations. According to the invention, the polar expansions ( 42 ) are connected by a connecting bridge ( 48 ) to the internal edge ( 38 ) of the said laminations.

1 . Electric machine comprising a rotor and a stator, the rotor being formed of a rotor body with a stack of laminations and placed on a rotor shaft, the laminations comprising housings to house magnetic-flux generators situated between the external and the internal edge of the laminations, wherein the polar expansions are connected by a connecting bridge to the internal edge of the laminations. 
     
     
         2 . Electric machine according to  claim 1 , wherein the laminations comprise a connecting surface connecting the bridge and the internal edge. 
     
     
         3 . Electric machine according to  claim 1 , wherein the bridge has a circumferential dimension (Dpc) that is smaller than the circumferential dimension (Dep) of the polar expansion. 
     
     
         4 . Electric machine according to  claim 1 , wherein the bridge has a circumferential dimension (Dpc) corresponding to approximately 10% of the circumferential dimension (Dep) of the polar expansion. 
     
     
         5 . Electric machine according to  claim 1 , wherein the bridge has a heightwise dimension (Hp) corresponding to approximately 10% of the height measured between the external and internal edge of the laminations. 
     
     
         6 . Electric machine according to  claim 1 , wherein the laminations comprise an air space between two successive polar expansions and facing the housing.